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Report No.

Electronic stopping power connected with average charge reduction for swift carbon cluster ions in carbon

Kaneko, Toshiaki*; Ihara, Kosuke*; Kono, Maasa*; Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa

The aim of this study is to present the electronic stopping power for swift carbon clusters as a basic quantity, taking account of the charge reduction effect, in order to promote attention of experimental researches and to contribute to collection of cluster-impact electronic excitation data. This theoretical research is composed of estimating the reduced average charges of constituent ions in a cluster and evaluating the electronic stopping power for a cluster, using the reduced average charges. The theoretical basis in the present study is to describe the incident cluster as an ensemble of partially stripped ions, where their charges are determined by the self-consistent cluster average-charge theory, and their spatial charge distribution is described in a statistical manner. The excitation of target electrons is treated in an electron gas model. In a case of carbon target, four electrons per atom are assumed to participate in electron gas and the rest two electrons are in the 1S state. As a result, the average charge per ion decreases with increasing the number of constituent ions in a cluster. This tendency can be understood by the theoretical model, which leads us to a conclusion that increase of the surrounding ions implies enhancement of the binding force on ionized electrons, resulting in less degree of ionization.



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